6620 combine hydrostat charge pump

Once the bushings wear, the gears gnaw away at the aluminum center section of the pump.

If you were to install new bushings and get the shafts back centered where they were when it was new, there would be a gap between the gear teeth and the pump body allowing oil to leak past causing poor pump performance.

That is why they are pretty much a throwaway item when worm much.
 

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